CVE-2025-38498

Kernel corruption via unchecked mount propagation change

Published Jul 30, 2025 · Updated Aug 5, 2026

Improper input validation in Linux kernel mount propagation allows local users to corrupt kernel state through mount(2). The do_change_type() path changes propagation settings without verifying that the target mount belongs to the caller's mount namespace, leaving dangling propagation links. A user namespace can supply the required mount capability; exploitation can expose or overwrite kernel memory and panic the system.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Linux kernel mount propagation allows local users to corrupt kernel state through mount(2). The do_change_type() path changes propagation settings without verifying that the target mount belongs to the caller's mount namespace, leaving dangling propagation links. A user namespace can supply the required mount capability; exploitation can expose or overwrite kernel memory and panic the system.

The record

CVE
CVE-2025-38498
Published
Jul 30, 2025
Updated
Aug 5, 2026
Vendor
Siemens
Product
SCALANCE XRM334 (24 V DC, 12xFO)
Classifications
CWE-20, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V3.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SCALANCE XRM334 (24 V DC, 12xFO)version=0 <V3.3
Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*
Siemens · SCALANCE XCM324version=0 <V3.3
Siemens · SCALANCE XRM334 (230 V AC, 12xFO)version=0 <V3.3
Siemens · SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 familyversion=0 <V3.3
The Linux Kernel Organization · Linuxversion=07b20889e3052c7e77d6a6a54e7e83446eb1ba84 <064014f7812744451d5d0592f3d2bcd727f2ee93; version=07b20889e3052c7e77d6a6a54e7e83446eb1ba84 <12f147ddd6de7382dad54812e65f3f08d05809fc; version=07b20889e3052c7e77d6a6a54e7e83446eb1ba84 <19554c79a2095ddde850906a067915c1ef3a4114; version=07b20889e3052c7e77d6a6a54e7e83446eb1ba84 <432a171d60056489270c462e651e6c3a13f855b1; version=07b20889e3052c7e77d6a6a54e7e83446eb1ba84 <4f091ad0862b02dc42a19a120b7048de848561f8; version=07b20889e3052c7e77d6a6a54e7e83446eb1ba84 <787937c4e373f1722c4343e5a5a4eb0f8543e589; version=07b20889e3052c7e77d6a6a54e7e83446eb1ba84 <9c1ddfeb662b668fff69c5f1cfdd9f5d23d55d23; version=07b20889e3052c7e77d6a6a54e7e83446eb1ba84 <c7d11fdf8e5db5f34a6c062c7e6ba3a0971879d2; version=2.6.15
Siemens · SCALANCE XCM332version=0 <V3.3
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.5 <*
Siemens · SCALANCE XCM328version=0 <V3.3
Siemens · SCALANCE XRM334 (2x230 V AC, 12xFO)version=0 <V3.3
Siemens · SCALANCE XRM334 (24 V DC, 8xFO)version=0 <V3.3
Siemens · SCALANCE XRM334 (24V DC, 2x10G, 24xSFP, 8xSFP+)version=0 <V3.3
Siemens · SCALANCE XRM334 (230V AC, 2x10G, 24xSFP, 8xSFP+)version=0 <V3.3
Siemens · SCALANCE XRM334 (2x230 V AC, 8xFO)version=0 <V3.3
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.3
Siemens · SCALANCE XRM334 (230 V AC, 8xFO)version=0 <V3.3
Siemens · SCALANCE XRM334 (2x230V AC, 2x10G, 24xSFP, 8xSFP+)version=0 <V3.3
Siemens · SCALANCE XCH328version=0 <V3.3
Siemens · SCALANCE XRH334 (24 V DC, 8xFO, CC)version=0 <V3.3
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*

Published CVSS scores

7.3Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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